Henry van hoevenbergh



(No Model.)

H. VAN HOEVENBERGH,

METHOD OF UNISONING PRINTING TBLEGRAPHS HAVING TWO TYPE WHEELS. No. 316,690. Patented Apr. 28, 1885.

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llNrTnn HENRY VAN HOEVENBERGH, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE BALTIMORE 8t OHIO TELEGRAPH COMPANY, OF BALTIMORE, MD.

METHOD OF UNISONING PRlNTlNG-TELEGRAPHS HAVING TWO TYPE-WHEELS.

SPECIFICATION forming part of Letters Patent No. 316,690, dated April 28, 1885.

Applicalion filed August 7, 1884. (N model.)

To all whom it may concern.-

Be it known that I, HENRY VAN HOEVEN- BERGI-I, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain vices for Printing-Telegraph Instruments, of which the following is a specification.

\ i I My invention relates to the class of devices r0 employed for maintaining the type-wheels of telegraphic receiving-instruments in unison with the transmitting apparatus.

In two other applications bearing even date herewith I have described certain peculiar I forms of receiving-instruments wherein one type-wheel is rigidly secured to "a type-wheel shaft, while the second type-wheel in the one instance, and in the other instance a segment ,of a type-wheel, is loosely supported upon the shaft and is capable of being coupled with or locked to the rigid type-wheel at the will of the transmitting-operator.

This invention relates particularly to aform of unison device which is especially adapted to be employed with the class of instruments described in the applications referred to; and the object of the invention is to provide a simple and efficient form of unison device whereby the type-wheels of not only this precise form of instrument, but various other instruments employing two type-wheels may be readily controlled.

The invention consists in applying to the movable type wheel or segment a locking-pin 3 5 which is adapted to enter an aperture formed in the rigid type-wheel, thereby coupling the two wheels together. An electro-magnet is provided for withdrawing this coupling-pin from the rigid type-wheel and holding the 0 loosely-mounted type-wheel in a given position while impressions are being taken from the other type-wheel. When the armaturelever of this magnet is in a given position, the locking-pin will, by striking against the lever, 5 cause the arrest of that type-wheel at its unison-point. If, therefore, the two type-wheels be locked together, both type-wheels will be arrested at unison.

The armature-lever is designed to be held .new and useful Improvements in Unison Deout of the path of this pin during the opera- 5o tion'of printing from the second typewheel, the two wheels being locked together. When, however, it is desired to secure a unison, the armature-lever is allowed to move into the path of the locking-pin and to arrest the type- 5 5 wheels at unison. The lever may then be employed for unlocking one of the typewheels from the other, if it is desired to employ only the one which is rigidly carried upon the shaft.

In the accompanying drawings, Figure 1 is a side elevation of such parts of a printing telegraph instrument as will serve to illustrate my invention, and Fig. 2 is a plan view of the same." Referring to the drawings, A represents a type-wheel shaft upon which is rigidly mounted a type-wheel, B. A second type-wheel, O, is carried upon a sleeve, 0, surrounding the shaft and movable upon the same. The sec 0nd type'wheel, G, is of somewhat greater diameter than the type-wheel B, so that if type upon both type-wheels be at the same time presented to the printing-platen l? and the platen actuated an impression will be taken from the larger, to the exclusion of the character upon the smaller, type-wheel. At a point, d, a portion of the type-wheel C is cut away, so that if the type-wheel C be arrested with the point (I presented to the platen an impression will be taken from the smaller type-wheel, for the reason that the platen will not be arrested by strikingthe periphery of the type-wheel C. It is essential, therefore, that some-means be provided for unlocking the larger type-wheel and holding it in such position that the point cl is presented to the platen when it is desired to print from the type-wheel B. For this purpose I employ an electro-magnet, M, the armature in of which c is provided with a lever, m, carrying a catch, m". The catch an is designed to engage apin, e, which is employed for locking the two typewheels together. The pin 6 is carried in the type-wheel G, and it is pressed toward the 5 type-wheel B by a spring, e.

In the type-wheel B is formed an aperture, 0, into which the pin 6 enters when the two to insure that the pin e is opposite the catch m when it is desired to unlock the type-wheels. For this purpose the pin 6 also serves as a unison-stop. If the type-wheels, after they have been locked together, be revolved with the armature-lever m in its position away from the type-wheels, the pin 6 will strike against the lever and thereby arrest the typewheel Gin a given position, and both typewheels will be arrested simultaneously. If, then, it is desired to withdraw the pin 6, it is necessary, first, to impel the armature-lever m from the path of the pin ethat is to say, toward the type-wheels. There will then occur a slight advancement of the type-wheels, for the reason that'owing to the position of the lever m and pine the escapement-pallet will not be allowed to fully enter the space between two teeth until the lever has been thus moved. This advancement of the typewheels', after the lever has been allowed to move toward the type-wheels, will bring the pin 6 into position to be engaged by the catch m. If, then, the lever m be impelled from the type-wheels,the pin will be withdrawn in the manner described. If, on the other hand, the type-wheel B alone has been employed, and it is desired to lock the same to the typewheel 0, and'the pin e be released when the aperture (2 is not opposite the extremity of the pin, then it is necessary that the wheel 0 be held at rest until the aperture is brought beneath the pin by the revolution of the typewheel B. For this purpose a shoulder, m is 5 formed upon the armature-lever m, of sufiicient length to engage the extremity of the pin 6 when the lever is in its position adjacent to the type-wheels, provided that the pin has not entered the aperture o The wheelO will v electro-magnet M is preferably constructed in the manner of a polarized electro-magnet, the armature m being impelled in one direction by positive currents and in the opposite direction by negative currents, and it may be included in the same circuit with the escape ment-magnet. The electro-magnet M may be included in an independent conductor.

I claim as my invention The hereinbefore-described method of controlling two type-wheels, which consists in retaining one in a predetermined position while the other is free to advance, locking the two together, and by such operation bringing the second type-wheel into a position corresponding to that of the first, releasing both typewheels when so locked, interposing a detent in the path'of the same for securing a unison of both type-wheels, and revolving both until arrested thereby.

In testimony whereof I have hereunto subscribed my name this 26th day of June, A. D. 1884.

HENRY VAN HOEVENBERGH. [.L S.]

Witnesses:

DANL. W. EDGEOOMB, CHARLES A. TERRY. 

